Piston-rod toggle for fluid-pressure motors



W. H. KELLER AND A. SCHINKEZ.

PISTON ROD TOGGLE FOR FLUID PRESSURE MOTORS. APPLICATION FILED APR. 29, 1920.

1,398,328. Patented Nov. 29, 1921,

can stares earner WILLTAM H. KELLER AND ALBERT SCHINKEZ, OF GRAND HAVEN, IVIICHIGAN, ASSIGNORS 'I'O KELLER PNEUMATIC TOOL COMPANY, OF GRAND HAVEN, MIGHIGAN, A CORPORATIQN OF MICHIGAN. l

PISTON-ROD TOGGLE FOR FLUID-PRESSURE MOTORS.

messes.

Specification of Letters Patent. Patented 'NOV. 29, 1921.

Application filed April 29, 1920. Serial No. 377,507.

To all whom it may concern:

' Be it known that we, WILLIAM H. KELLER, a citizen of the United States, residing at Grand Haven, in the county of Uttawa and State of Michigan, and ALBERT SGHINKEZ, a former subject of the Emperor of Austria, residing at Grand Haven, in the county of Ottawa and State of Michigan, have invented certain new and useful Improvements in Piston-Rod Toggles for Fluid- Pressure Motors, of which the following is a specification. I

This invention relates generally to a novel construction in fluid pressure motors of the type used in portable drills, pneumatic tools and the like, and relates more particularly to the piston rod connections, known as toggles, which coast with the crank shaft.

The primary object of this invention is to provide a simplified toggle construction and thereby materially lower the cost of manufacture and greatly increase the facility with which the toggles maybe assembled or replaced in a complete motor.

Another object is to provide a strong and durable construction which will increase the life "of the toggle under severe conditions of service. I

These objects we attain by anovel structure the parts of which may be stamped out of sheet metal, and which comprise simplified and strengthened means of mounting on the piston rod and crank shaft wherein a considerable amount of labor is saved in the manufacturing, quent repair of a motor, and the life of the structure in service isincreased. g

It is the common practice, in motors of this class, to arrange a plurality of cylinders about a common crank shaft, the cylinders beingangularly disposed in pairs in which the pistons are operatively connected with one crank bearin Hinged toggles are usually employed, one overlying the other,

which are secured to their respective piston rods by means of a binding nut engaging the toggle ends. In the usualconstruction it is found that the toggle hinges frequently.

shear off, and that thebinding nuts split under the strain of service. Also, the toggles now commonly used are made of assembly and subseings requiring many machining operations in their. manufacture, and they are very difticultto assemble in the motor due o their design and the necessarily restricted space in the crank case.

These objectionable features are avoided in the structure disclosed in this invention, as will be apparent, with other advantages, in the following specification of one embodiment 'of the invention.

In the drawings, Figure'l represents in sectional view a'nair of pistons, showing the piston rods and toggle connections in elevation. The cylinders, valve mechanism and crank case are indicated in outline as embodied in the preferred structure described in our pending application, Serial .No. 228,570, filed April 15, 1918. Fig. 2 repre-: sents a side elevation of a piston rod with toggle assembly as viewed on line 2-2 in Fig. 1. Fig. 8 represents in perspective the parts of a connections.

In Fig. 1, numerals 1 and 2 indicate a pair of toggles and piston rod pair of cylinders arranged with their axes I at an angle and in a common plane. The pistons 3 and 4 operating therein carry piston rods 5 and 6 to which are secured the toggles 7 and 8. Toggle 7 has its bearing directly upon the crank journal 9 while toggle 8 overlies and has its bearing upon toggle 7. A valve mechanism associated with the cylinders is indicated at 10.- The crank case, indicated at 11, has two lateral openings 12, which are closed by removable plates and designed to provide access for the assembly or repair of the toggle connections.

' The toggles are of two piece construction. The inner toggle 7 comprises two members 13 and 14 (Fig. 3) each forming half of the bearing 15 and 16 and having lateral extensions 17 and 18. The extensions are perforated at 19 and 20 to receive a clamping The member 14 has a tongue 21" In assembled position the extensions 17 and 18 abut on their inner tacesand are adapted to be rigidly clamped to the piston rod by engagement within and abutting the base of the yoke formed by the recess 27 cut in the outer end of the piston IOC. The yoke arms are bored transversely at 28, in register with the holes 19 and 20 in the toggle members. The assembly is secured in position by the clamping bolt 29, having threaded engagement with the yoke. A lock washer may beseated in arece'ss 31 formed on the yoke, and provided with straps 82 which maybe bent up against the lateral faces ofthe bolt head. A slot 33 may be cut longitudinally at the base of the recess 27, to'give uniformbearing of the yoke arms in clamping the togglemembers.

The outer toggle 8 also comprises two members 345 and 85, having lateral extensions .36 and 37,.perforated at 38 and 39.

- The two membersiiet and are secured to their r spective piston rod by means similar to that just described for the members in the inner toggle? The members 3% and 35 v are formed with curved straps 40 and A1 whose internal surfaces are adapted to bear upon the journals 25and 26 formed on the inner toggle members. In assembled position the extensions 17 and 18 on the inner toggle members extend through the aperture formed between the straps 10 or 41, as may be selected, and operatively swing therein. The straps 10 are integrally con-.. nectedat their outer ends by a cross bar 42 which extends the full width of the member and is raised above the outside contour of the straps. T he straps 41 also are integrally connected at their outer ends by a cross bar as, on which is carried a curved portion i5 forming an outwardly curved hook adapted bers.

from sheet metal.

to engage the bar 4-2 between the straps 40, thus positively securing the engagementof the members 3 and 35 in their assembled position about theunderlying toggle mem quickly and conveniently done through the openings provided in the crankcase. 'ilhis' connection likewise provldes great rigidity and durability. A further apparent advantage lies in theintegral connection in each 7 member of the outer ends of the straps torming-the outer toggle bearings, together with the integral interlocking bar extending the. i ullwidthlot the toggle member and the wide hook engaging therewith,;thereby providing a strong durable engagement at a point of considerable strain.

Vi e would have it understood that the invention is not limited to the construction herein shown, as various modifications may be made within the scope of the appended claims.

We claim as our invention 1. A fluid pressure motor having two cylinders in angular relation to each other, pistons'therein, a crank shaft and a crank case, in combination with two piston rods each having an end connected with one of said pistons, the opposite end carrying clamping means, a separable part toggle connection bearing upon said crank shaft and rigidly clamped to one of said piston rods, a separable part toggle connection having spaced curved portions bearing upon .the first mentioned toggle connection and rigidly clamped to the other of said piston rods, interengaging means for locking in operative position the outer ends of the ;sepa-- rable parts or" the second mentioned toggle connection, said means comprisingintegral bars extending across the outer ends of said curved portions, one of said bars carrying an outwardly curyed hook adapted to engage the other of said'bars between its said-curved portions and interlock therewith, and lateral detachably covered openings through said crank case arranged to expose said toggle connections.

2. Means for connecting a crank with a pair of reciprocatingelements comprising an inner toggle and an outer toggle stamped from sheet metal, the inner toggle composed of two complementary members each having a semicylindrical bearing portion adapted to embrace the crank and a lateral projection adapted for attachment to aconnecting rod, the outer toggle composed of two complementary members each having spaced curved portions adapted to embrace the, bearing portion of the inner toggle, and a lateral projection adapted for attachment to a connecting rod, the outerends of the curved portions in one member being integrally joined to form a cross bar of the full width of said member, the other .ofsaid members having its complementary curved portions integrally joined to form an outwardly curvedhook adapted to pass inwardly of said bar'betweenits adjoining curved'portions and interlock the members in operative position.

3. In a fluid pressure motor, an outer toggle connection comprising two comple-:

mentary members stamped from sheet'metal, each of said members having two spaced straps cylindrically curved and adapted to embrace in bearing engagementan inner toggle, the straps being integrally oined. their ends by. cross elements, one pair of crosselements carrying lateral means of attachment to a piston rod, the other pair of cross elements having means for interlocking the outer ends of the toggle members comprising an outwardly curved hook formed on one cross element adapted to extend between the spaced straps adjoining the other cross element and engage the latter cross element &

mentary members when secured in operative position.

In testimony whereof We have hereunto set our hands.

WILLIAM H. KELLER. ALBERT SCHINKEZ. 

